Digital volunteers can help respond to disasters through crowdsourcing. They provide information and solutions in five ways: advocacy on social media, crowdsourcing situation reports, creating crowd-sourced maps, developing crowd-generated solutions, and crowd-based information management. Effective digital disaster response requires coordinating these efforts using technologies like social networks, blogs, and collaborative workspaces to facilitate knowledge sharing between volunteers and aid organizations. Governance policies are needed to address legal and security issues from crowd-sourced crisis information.